Oil stove



Oct. 9 '1923.

R HOFFMAN 01L STIOVE Filed July 5, 1919 2 Sheets-Sheet 1 w mini R. HOFFMAN OIL STOVE Filed July 5, 1919 2 Sheets-Sheet 2 Patented on. 9, 1923 esgm nmmmw, F KAnKAKEn'iLL'INms,

. on GHIQAGO, ILLINOIS; A QORBOQAIIQNQE NEW,Y(T)RK I 7 7 i 'A pplieajfionx-filediuly j I citizen of the Unitecl'Staces, residingwit ICankQkee; in thefeountyof Kfan-kakee and State of Ill nois, have invented. certz nnew' and useful Improvements in Oil Stoves, of i 'Which the followingiis aslfieeification.

invention relates to ojil stoveofitliey type emboclyingeal constantlevel; 011 supply reservoir anplone or'more burners mounted for Vertical moveine'nt-lwithj reference to" i especial refrenee to the means providing an extensible-pipe connection between-fa stammggmm usuallyeniployedgbetween the two 3 telescoping pi pe seotions having been fon'n clj inarlequ'zitefor; properly seuling' a-he Slidingjoint therebetweenby reason oflthe attraction past the pgreking; efpeciallylwhen' the hitter has become sl ghtly. \yorn 111 user Thepr nen nil ob eo't of th s lnventlon 15 Y 3'20; provule n'noxie'l. nieth'odfl of Sealing the;

" joint*betweenlghe two telescopingSections tiOns-fandnj further:objeot of'the invention ifio providenieans lior-effeotively prevent ingfthe leakage of the mercury employed while the V stove is heingxshipped n'n'r lr under similar situations.)

"uceoxnpzinying' drawings: forming part here-;j

' ofi'in' WhilchFigure 1; is :'an-a mentary side "f fieleva'tion of a. e e eli clyi gf the features the stove-leadingfrom th clifiioulty has been encountered in providiiigj I u L an extens blepipe conneotion" oa'pableof ef-f feetiVely;preventing theje seape of 011', the

len ilen'ey' of" -the 011 to; Creep ;l }y' Capillary V The foregoing o ;jeot,-oflche invention is accomplished by the'pr'ovis o'n 'a' nercury;

I l lions 7 f'and' 7j i 'seallietween the relit-lvelymovable pipe seo STOV Y line 4-4 of Fig. 5. Fig. s a fragnientary' supply-fianlfQ communicating in a "Wellknownmanner-withgaxonstantlevelo il r As'sI G noPJ-To sEARsjon-finck 15 ofi'n1y' invention/1Fj'2 is a frzignient'ziryp horizontal Sectionon. line-2+2 of Fig "31 ftheplaneof line 'OfFig l. Fig. {L is it fragmentaryvertical section- 'taken on the" I frame-:14:lislfhniainbildeliver'ypipe for-1 7 u frame. i1 designates genere l'ly-a burner havmg anlol-l I receptacle 63'; commonly 'teri'iziedi a burner'lbowl 01* trough which 33 adapted -to' be. connected to the m in delivery pipe4 byv meansof zin extensible. pipe eonne'etionj 'l. if 1 Means 1nolud 1n'gn'hancl Wheel arefa'da pted: to effectthe lillSl IlgfLIldflOWQI'lIlg moven'ientsof the burner rela tive to ithe well Theioil' app-1 tank 2 Well 3 antl'gjle'li'iiery pipe 14 maybe of}any-suitable;ancl'nielh' V V kno vn" coniebruction and" ztrimifienienfi,new may alsoibe' the humor v5fl w ith' its oiliitrough 7 16. .I It is therefore" deeniecl unneees'sm'y to il'lustratennd clescribetfhese-parts in cletai'l.e

Po t n a ionm i lymmmted o ficheistoi e w if The ex tensi ble f' connec tion a 7 between i th j r the main delivery pipe A; icomprises fiwo S904;

aea rrieclireeneotively; by the of 21 diameter slightly less than :the 'diame-g na- Well knownlzmainner tov he I-delivery I tier of the seetion'; 7F and at its lower f is T screw-threaded Q intofzi fitting 8 Qconneeted i r 5R pipe 4 st) as to; conrn'n nicipte therewith? :The':

of the burner howl 6,? being; secured thertrfi l Pas =by brazing qn'c 1e ad ada'ptecl' to eooperatively eng ge:jW ith' the,

reference thereto and having a set screw 7 14 therein adapted to operatively engage 7 the fitting. "It Wlll be seen that by tighten- 5 the screw 1A, the fittingS; be drawn downwardly onto the deliverypipe, t" andends of said links is ablock 13 fixed With firmly clamped inposition thereon, the. slots 15 in the links permitting relative jrnovemerit of the studs'therein in this operation;

For thepurpo'se; 01? providing an annular 1 channel around, theinner. pipe, section 7 V i f of the; extensible delivery pipe, for there ception of a quantity of mercuryf -n wh ch the lexverend otth vvpipe section 7 may. be

immersechrl providelatubularistem or mem 16 carried by the fitting '8. -f This mem; it her isin; thievvform loff p pe oi a diameter semewha greater than the diameter-of the pipe-section 47 and at: itsfjho'wer end is threaded-into a secket' lTpro'v-ided inthe upperportion offthefitting .8, Y The pipe section J r-and thetubular: member 1.6 are 7 thus 7 spaced apart-to-form achannel 18.. Said.

concentrically arranged fl and. *are channel is of sufficient width to provide spaces-upon opposite sides of the pipe seclilled with" asealing liquid suchas mercury ,,l;9-. Itiw'ill be seen: that oilstanding in the 7 per. portion est-the tubular ineinber 1.6i

' the pipe section 7 It ,wiillTl V ,wvh'enlit isidesired to-remove f'the' burnerf from thestove it is onl-y' necessary to disengage-the clamping members 22,:lrom the ,collan23-aga inst theaaction of thej's pring however, the upward pipe section Wand overflowing Iintothe space between it"and the SGCtl01'L7 is prevented from flowing around the lower end 9 of the section "1 {by the-*mercury in'the channel into WlUChl SELl'Cl section: extends The means for raising and lowering the burn-er comprisesa rotarymember ornut 26 having secured on its -u-nden side a'han'd Wheel 21, andheing threaded upon the. up-

Rising Irom sa dynut are a pair of spring arms 20*" having iat; their upper' ends' clamp iii-i1 members 22 adaptedto engage with a collar 23 'fi-Xe'd on the outer periphery of seen that arms 20 Normally,

' movement of the burner is: limited by means to be hrcctty described;to-prcvent the with dnaival of the lower end of'rthe outer pipe section 11d fromsthe mercury-1n the channel;

operat on oi; the burner,

V the i'nent of the nut QLO' and thereby of the burner comprises aspider 241 mounted upon the under side of thehand wheel 21 and having 7 a central ring 25 apertured to receive the jecting lug 27 adapted to be engaged by the upper surface of the ring 25 in the opera tion of thenvheel upwardly relative to'the tubular member 16. Said stop member may theflanged outwardly at its lower end so as to editendi between the .l'ree e nd off the horizontal portion 12 of the link 10 and the hor zontal portion 11 ofathe linlr'9 and then downwardly between the fittingt and the linl-il). this construction, the stopmernher is clamped inpositioirby the" means for; fasteningthe fitting 8 upon thehorizontal portion of the pipe 4.

rts, it will be seen that the annularchan- 8 formcdbctween the tubular member 36' and the inner pipesection: To? isopen at its upper end; For:efiectively c -QS g 3 channel wien the stove is to be sh pped 'ortransported from one'place to another and thus prevent theleakageol niercury'therefrom, i provide nieans'carried bv the'pipe h V p section andmovablc nto ClOSHIgLPOSltlOIl j bvmeans oZ-thc raising and lowering means.

1 e In thenornial or operative positionrof the Suchclosin'g means comprises'fian annular valv emember 28 on the outeriperiphery of tion -Which at the lower ends thereof are the pipe section'i g'and' an annular :valve n'icmber 29 fixed on. the; inneifperiphery of V th'e'pipe section 7 Herein the annular valve member 528 on the outer periphery ofisaid VPIPQUSQCUOYIQE formed integral with" the collar and both of said members are beveled at their-lower;ends as at 30 and 30? and areadapted to befdra-Wndownwardly into engagement vith inclined seats formed upon the upper ends (ntthepipev section :7? r

the hand Wheel 21'. Its ill be seen that said members after'beingiorced into snug entubular nember'as well as o'fgtlie clamping members 22 with the collar F or the purpose of indicating to the user the properpositionsiioirthe burner in iuse,

stopinen'ibcr 26 maybe provided on its:

forwa d :facewvith" 'a scalo'having suitable 7 legen-z-is thereoinsuch as Duty Medium 211R Lightthe spider 2% becomes positionedopposite these marl-1s, in tlie'raising and lowering (3'). VVhen'the ring'25 of they will indicate 7 respectively, that the burnertrough has been raised above the constant oi'l 'level thatthe trough has been raised to ajm'idway position with it upper; portion above; the oil, level,v

V or that the trough is in litslo'wermost poi-i sition with its npper edgej ji s't shove" the oil level, as shown'in F ig, 3.' The movement of the trough 6 belowthe' constant oil level; is preventedby the annu'lar nembers28 {and QQV- ngaging with their se'ats'iupon the upper. ends ofthe' pipe section and the tubular member 116; 'TheseIa nnular members are} however, only drawn 7. down tightly? npon'.

theirvseats when the'stove is to' bemoved, so

as to prevent the escapeor 'leakage of the mercury,ifftheistoveds tipped upon endv or inverted in themoving operation.

Snitable means may beprovided for gnid the burner in its Vertical movements,

preventing va rota-tionof thepipesectio i 7 rele'ti e ito ,theftubnlar i iegriberf 16, as the hand wheel is rotated. Herein suchmeans I comprises a rod 3 lfixed npon'the, inner side. offthetrough fi ofthe lonrner'fand depend ingthrongh 'rtnf. 'epeiturel32 in Va laterally pro eeting member rSaiclf-laterslly pro jectin member 33 isrein shown as b i fiormed m -W ih horizontal porti n ofthe link 9. A y p t will e see thatiihgve piov r cia n" e'lh'cient extensible. ipe connectionffor 011;

' stoves e'mbodyihg Vertical-1yaniovablefbiirners, It is of comparatively 'siinple construe ClOil and the seal, is ofsuc 1 chsracter th at over the" v'alye-"Frnombers. 28 Land. 29 .when

forced 2 upon their se a-ts efiectively prevent the escape of the "mercury. when the stove v is invertedes inshipmentin spite ,offithe} diffic'ulty commonly experienced in ,,e fiec' tivel preventing Ja leakgge of mercury ow -v 4 ing to its high specific grayity. "@Itf is zilso tribe noted that the raising-1 and lowering IIlQililS'lS ofsuch character that zt-rz pidlow eringofthe burner becomes impossible, such. rapid lowering being objectionablebecause ofthei tendency of the oil in the inneigp'ipe forced upwardly into the.

section T7? to lee fve'ntion with cionside able particularity, it

will be nnderstood th' PI dov not intend that shall be limited in the the supply tank; stitutes s rever of thatherein disclosed.

In co-pending spplicetion; Serial No, 5 l0,74 filed-M;arch 3,1922, I haveshown and described s raising, and"lowe-ring fmean f substahtially'similar to that herein disclosed,

lD-ICODIleClI-lOIl with a; preferred embodiment l f; the inien ie sx d i 'wmp n th:

L. ili j'stovo V coinp risiiwbroadly in said zipplication I clsim'ss my invention: t

the statute, I "am claiming said means 1:, An oil stove eoniprising, in combine-f ti' ni, with wicon stantg'letel oil s' i1p ply reser vo r, a meinidellveryj plpe an 011 burner including a :troug lifan extensihle pipe co nnection compris ng an innerv stationary pipe sectioi poinninnicating atiits lower end with said" delwory pipe, on outerpor movable pipe; ,,section fixed with reference to said troughhnd communicatingtherewith end of greater diameter than the inner sectionso,

as to loosely creceiye'the latter, a tubular member fornnngwithsmd inner SECtlOD-QIL annular channel jfor "the reeeptionfiof 1; quantity otmercnry into which the lower end {of t'he'outer pipe section is adapted to be immersed, means for raising and lowering ctliertrough'dand meenson said. movable pipe' sectioii adapted to engage withh seid tnbularfinember and the p to closesald annularchannel.

innerw pipe section 2., Ami oil) stovecomprising, in coinbinm tion, with" con stant level oil supply reservoir and" a burner comprising 'a' vertically movable trough, in'ea 11s for conducting oil :7 from said reservoir toyseld trough inelnding two "relatively stationary pipe-sections spacedapart to i ormlen annular channel 1therebetween' for the. lCCQplHOlT of 1a quan-c tit ofim ercui" .itndetirelativel .1novable ,3 l, v y y pipe" section the lowei end of, which is.- adapted tobev immersed in saidfmercnrcy and means-for linoir-ingjtheburner and; said movable pipe section relative towsaid ress" ervoir;

3.,An oilstore comprisinp in con'ibina tion with a constant-level oil supply reservoir haying;zifhorizontz l delivery pipe gl nt. it burnerniovahle vertically IGlRlllVG' to. sitdpipc, means foncond cting o supplyof oil .from. saidfdeliycry pipe to said burner comprising two concentric pipe sections spaced apart. to "fol' m; it channel for receiving a; quantity of rnercury the inner pipe section 1 commo with saiddelivery pipe, {L m ely ii-10 n il npesechon fixed with f A? into said channel Inersod. E n; so d inercui her -and communicating mg jtslowerend depend ridgarranpgedto be i1n;,

and IIlGLLIISV OH' StU l Ql V movable pipe section fgi'dspted to close said I in combine- 7 tion with 21 "constra nt-level oil s ipplyi'ese voii', a de-liMery pipennd" burner-vertically iOVLible relz tiveflto "said,greservoir, niieans livery pipe to said} bunner comprising fit ior cond-nctings shp-ply'of oilfi'rom said dei N ting mounted ongsaid'delivery pipeand 'com,

mui 1icating therewithia pair of pipesscreW-I I threaded into said,fitti'ng and mounted li El i n 1 13 to form an: annular h n l the ew t he" o e. of mid i in i at

pipes communicating through said fitting with the delivery pipe, and a relatively movable pipe section fixed with reference to said burner and communicating therewith and the inner one of said first-mentioned,

lower ends in said litting in' spaced rela-,

tion so as to form an annular channel therebetvveen, a movable pipe section fixed with reference to said burner and adapted to de pend into said channel around said inner pipe section, said inner pipe section com- 7 municating through said movable pipe section with said burner, means comprisinga pair of annular 'n'iembers at the upper end of said movable pipe section adapted to engage with the upper ends of said stationary pipe sections to closesaid annular channel, and a nietallicliquid in said annular channel into which the lower end ot' said movable pipe section may be immersed.

x6. An oil stove comprisingpin combina: tion with a constant-level oil supply reservoir, a delivery vpipe'and a burner movable vertically with reference to said reservoir, a fitting on said delivery pipe,"a pair of spaced concentric pipe sections rising; from said fitting and forming a channel therebetween, a movable pipe section fixedwith reference to said burner and having its lower end entered in said channel, said channel being adapted to receive a quantity otmetallic liquid to provide a seal between the, stationary inner pipe section and said movable pipe section, the last mentioned'pipe sections being arranged to communicate at their opposite ends with the delivery pipe and,

burner respectively and means for raising and lowering said burner comprising arotatable member threaded onto the outer stationary pipe section and having, a sliding connection in a circumferential direction only with the movable" pipe section;

7. An oil stove comprising,incombination with aconstant-level oil supply reser-' voir, a delivervpipe and a burner movable vertically with referenceto said reservoir,

a "fitting on said delivery pipe,- a pair of spaced concentric pipe sections rising'from said fitting and forming a channeltherebe tween, a movable .pipe section fixed with reference to said burner and: having its lower end entered in said channel, said channel being adapted to receive a quantity of metallic liquid to provice a sealbetween the stationary inner pipe section and said movable pipe section, the last mentionedtpipe sections being arranged to coinniunicateat their opposite ends with the delivery pipe and burner respectively, and fine'ansfor lfllSr 'ing and lowering sa d biirner coinprising ia rotatable member threaded onto the, outer stationary pipe section and having a slid ng,

connection in a circumferential direction only with the movable pipe section and means on said movable section adapted to 01086 the Channel formed by the stationary pipe sections, r i

8. An' oil *stove comprising, in combinetion, a constant-level :oil supply reservoir, a delivery pipe and a burner. an extensible pipe connection between said burner'and said delivery: pipe including .two telescoping pipe sections having a metallic liquid seal therebetween,'means for raising and lowering saidburner relative to said reservoir comprising a stationary tubular member, a

rotary member threaded on said r tubular member and operatively connected with the biirner. and means for limiting the upward movement of said burner.

9; An oil stove comprising, in combination with. a constant-levelfoil supply reservoir,

a delivery pipe and a burner, an extensible pipe connection between said delivery pipe and said burner ncludingfan inner stationary pipe sectionan d an outer relatively inov able pipe section, 'saidp pe sect ons communicating respectively with said'delivery pipe and said burner, and'means for raising and lowering said burner comprising a tubularmember encircling the outer pipe section, a rotary member threaded on. said tubular member and operatively engaging said relatively movable :pipe section, and means for preventing the rotation of said burner and the movable pipe section thereon.

10. The combination of a horiZontal denection between said delivery pipe vand said burner including an innerrpipesectioi coinmunicating with said delivery pipe, an outer, pipe section ('0II1I1111n1CELt-111g"fW]l1 said burner and movable therewith, a stationary upright meiiibe'r, anda rotary member threaded on 11.0 V livery pipe,a b irner, an extensible pipe con-- i said stationary member and operatively engaging with said burnerto move it. r V

.11. The combination of a horizontal delivery p'ipe',a burner, an ext'ensible pipe c0nnectionv between said deliverypipe and said burner, a stationary upright stem, a collar 'fixed'with reference to said burner, a rotary member threaded on said ste n andhaving means slidably engaging with said collar for Y circumferential movement only, anda hand wheel for rotating saidrota-rymeinber.

12L V'l he combination of a horizontal de livery pipe, a burner, a'fittingjon said pipe and .epnimunicating :therewith; me'ansi-ifor Lconnecti'on'ibetweensaid-pipe seetions end a elamping said fitting on said: pipe inclndlng Tnie'ansfor preventingthe'esoapebf he mer- .a palr f-llnkSifiXCl Wllll'l reference-to-isaid- QcuTyavhen-the stove lS":1IlYeIted.j-v-

fitting and depending on :opposite sides of; 1-,1S.=The bombinatidn; withQ a vertioally I 5 said pipe, a block clamped between the lower rinovable bnrne jmf-means "foragniding the? f Y 1 5 np'anddownmove nents to saidbnrner an I end of said links, aclamp screw- Vthreaded T in -burnen for 'up fand down movement inoludsaid block and adapted toengagesaid pipe, ing an extensible pipe 'connecti on, andlrai sf" extensible ineans for, conducting 'a supply ing and lowering n'ieans comprisinga; collar" of oil fromsaid-delivei'y pipe tesaidIbnrner, fixedwithi eferenceitosaidibnrner, astationv I 10 and. means encircling the extensible means :ai'y npright stem,ca rotary member threadijfilf v imparting np anddownzrhovement tofgsaid ed on saidg steniand haizinga pair ofsprin'g 1 burner. i arms iprovidedfwith means ilfor lidablylen- I aging; saidgcollar for*niove nentceirenmfer- 13.. Thecombinationof a. horizontal; dea livery pipe, a burner, means for impartingwentiallyithereofonly." A v j El e 'l, conib"nation.1 withi a nerticallyifip extensible pipe connection between said pipe movable bnrnenxof; nieansflfor condnctingaand burner conipfisinga Stationary pipesecsupply of oil toiit'he? burner comprisingiga (ion coinninnicatingwith said 'delive 'ylpim, ipair of.telescopingr pipejseetionszand' 'aitl l 'll-r movable, pipe section j cjoinmunieatmg laristein providing a channel"fon'theireeep i openly with said burner, and ineansforming "tion:.0f:;a quantity of mereuryl and adapted an annnlar'channel With said stationany pipei to receive the Louter pipe a section with its I V sectionadapted to; receive inercurynorfthe "end immersed in said ineronry; raising" and i like'in which the lower end of said movable q-lolweiiing means 1foi':said -burner,-. including npipesection maybe immersed; a member threaded on said stem, aucolla r 14i. The combination of a, horizontalde :fiXed-"on the outer pipegsetiong means .on

l-i\'*ery pipe, a burnerg means for raising and 1 said threaded s neinber adaptedtofslidajblylowering said; burner, anezgtensible jpipe clainpjsaid: 'collar'and means forirot ating 1 connection betxy'een said-j' delivery {pipe and :said thfeaded nembei.;;zand-means actuated? liru 'fl comprisingga. stationary pipe ,-.se cby said raisinglandiloweringinieansforclosff.

aoltion commnnicatin with said deliver 5 i e 111 lsaid fannnlarjehann'el rincludinor,anla'm" a a 1g ,7. ii.i i. v

, movable p pe Sec i neoininunicating with nnla'r member; fixed on said 'ojntef 'pipe:seo-ffsaid burneig means fonniin'g: an annular"tion w ,channel with said stationary pipe section. 2 ().'I n an oilstove; the-coinbinatmn"with vadapted to reeeivejmerqniy or the, like in--an--0il supplypipeand a;.vertieally{mo'Vable i 5 jvhichl the lower endpf said movable pipeburnelgof an extensiblepipejconneotionfes I 40:. oil sup pl pipe, a bni'ner inciliiding. a trough;

. sectioni'nay'be .ini nersed, me ns, in itablishing"open 'c'ommunication bettieenisaid l inated by said i-aising and .lowe ying means pipe an'clsaidi bnrner,'i comprising ajpair -offj for closingthe upper end fisa clchanneL; te1escopingpip *isections, and -tmansgfor";.

v -11 n ili si vq h C mbin tion ofgan providing a seaklioi:':';n1 eI 'cni'y'or thelike; be

fineans YEIiSiIIg flmllQW iIig he -bnrner,' ;v 2137111 an'roil. stove, the combination with an extensiblelpipe,loonnection establishing a sonriceofoilfsnpplywand ac vertically movunrestricted communication between said deable bni'ner .ofan extensible fpipeI conneelivery vpipe anclsaid' trough-includingtwo tiongbeltween said sonrcelo-f- Oil stlpply and a swp e P p sa l 'n e s p ov' aidabultnergcOfi pl' ng e P r f P-L 5 'meaiisjfol raisingand loiileringthe.bnrner, jb t'h flno s amii ean V i bg' ner ibQXY lQIIlEZLDS or' mi'sin e P QY'J n t ms u e lf ih l d fi @iisqm f ing a m t li iqiiidis a ib e s i -pipe ing;pipe-sections," and meansje' pr viding{a sect o Q, 1 vliqniid;sealvoif-mercu ylor the likeibet'weem I 16. In an oil stove, the cornbination -ofan' said pip ggection raising nd] lowering ff :oilv supply p p bu erie h ng a rough; means Lion th bnnnei'fand means a etu'ated 2 a llg il el'ow ri gfimeansto f m P and a closure, for retaining liquid When-the stov 1 an extensible pipe connection betwee i ryi iwa 'se d hi l idi wb Tie i ve ed-i1! 1 is 1 t l 'cepe-p p lseet o i ;mea 'p vi it ga nai fip t e h o bin w h nietalliejliqnidisea 'bep-yveen' said pipe sec a 'sonrceofoilsupplyand'" .verti ally movr I o-zfmmg aclosnrejf oisre-, ableibnpner,oii'an:eg ten ble'f pip a jta'ining' saidjliqin i .;ti on betwe en saidisollree 0 oil npply and.

rertedigfgf I gsaicl bnrne yie nipr'isin ftelescopr 1 eii g5 -ingli-pipe"$6 ti9; r nsi gdleweringai bn iner inoliiding a :means f ofr. th ntnen, ana means carried by a i P 12 irs izt ons and movablety ise dlsr s n' a il we neme s:i tQJ n-V udin i pa f:' e opi epip'e e heao er;p pes cti itionifoifl cond nctiiig a. sn ppl f oil fro'm a clos'e theann ila -Spa e "Ith QITG/bQtWGIlsaid supplyfpip'e osaid'bnrn -bowl,] 'njeansgfi 23 lngan oilstove the.eombination 'withoil snpply' a e 'rticall mpvbeen, dliye y 1 11p mg the ibnr neij, anfektehsiblem qfm iee,

ing movable piper section cpmpris member screw-threaded on to said upright able-burner, of an eXtensi-b'lepipe connection between said source of oilisupply and said burner comprising two concentric stationary 'pipe sectionsspaced apart, and a movable '7 pipelsectionz adapted touenterwthe annular tivelyengaging with said burner to .move it i when the: memberqis' rotated, and I means actuated. in the movements of said "burner by ,said raising and lowering means to form a closure for retaining said; mercury 25'. In anijoil stove, ;the comb ation-with a burnerandi an oil supply pipe'mou-nted for inovenient relative to each othemof anvextensible pipe connection establishing open communication'between. said burner. and said supply. pipe icomprising two relatively moi able SGCiil0ll S 8tl1Ll viii-cans providing a liquid seal of mercury or the like betwe en V saidmovable sections. L126. Anoil stove. having a burner, and a teed-pipe ior oil,-;e: tens ible' toperinitolithe VGItlCELl; movements. of the burner, said. pipe 1 comprising two telescoping sections irespectively communicatingwiththe burner and a source of oil supply, andmeans provid ngv a metallic liquid seal between 'said'pipe seci'tions and adapted to'forni aclosed c-hainber for retaining the sealing liquid against escapez '7 i r 27. An oilstove having a burner, and a iteechpipe for supplying foil to the burner,

said p pe being extensible to 'perinitofthe yvertical movements of'the burner and comprising an inner pipe sectioncommunicating H wit'lra source of oil supply and an outer .pipe 'sectionflconf 'niunicating with the burner,

and means-operable by'a movement of the outerpipe'section into association with the other pipe'sectionf-whcreby to tightly seal the joint therebetweenf f j v a burner,

feed-pip or oilzeiztensiblefto 'per it} ofthe j vertical vem nts or the burneifsiid pipe comprising-a5 15a of telescoping pipe secionsf'an upright m mber rigid with one of said sections, means movable w th the outernostfpipe section into assoc ation with the other "pipe section whereby tightly seal the joint therebetween, and means to "mov- "stationary In an oil stove, the combination with i a verticallymovable burner and a stationary and a member and operatively associated with the movable. pipe section.

:29. An oil stove having, in combination, a

{burner, anoil'feed-pipe extensible to permit o'litlievertical movements 01 the burner, said pipe comprising two telescoping sections having a sliding joint therebe'tween, means for sealing the joint during the relative movement of the pipe sections, andfadditional means providing a seal between the sections when the burner is most position. 1 An oil stove having an oil l eed-pipe comprising pair of pipe sections spaced" I apart to form 1 an annular channeh aiid means 'operatively associated with the pipe inits lowersections soas to be capable of closing said channel.

. :31. In an oil stoveythe combination of a pair of pipesections spaced apartto iorm an annular channel, a third pipe-section extend into said channel, and means rigid with the third pipe sectiouand movable into operative association with the first-mentioned pipe sections whereby to close saidchannel.

A'npil stove hav ng in combinationwith a source of o l supply, a pipe formed in two sections having asliding joint therebet veemand means providing a channel-tor receiving a quantity of mercury or the'like and open at it's u'pper end to 'receive the outerniostpi'pe section for the immersion of the latter in the mercury. 1 r 33. In an oil'stove, the combination with 'aver'ti'c'a'lly movable burner and a feed pipe, of an eiitens'ib'le pipe connection between the burner andffeed pipe comprising" an inner pipe section communicating with the fee'd pipe and an outer pipe section communicating with-the burner, and a third pipe section associated with the inner pipe section to form an annular channel adapted to receive quantity of mercury or thelike, and,

Iinean's movable with the outer pipesection into operative association with both or the p1pe sections 'Sllllll taneousl-y whereby tozclose theupper end of said chanfe ed pipe, of. an extensible connectionbeas to foifinan annular channel, andla "thirdpip'e section "communicatingwith burner, said channel being; norm f end'i i fi 1 ,1 third pipe sectifon intoth f channel and b als'o adapted torec'eivefa"quantity offmer- I c'ury or the like in which the lower end of thethirdp'i p e sectionmay be'immersed. 7

35. lnan oil'stovd'twp parts operatively f ato ciated so, as" to condiiet'or for;

tween the burner landv fee'd pipe comprising V a 1 fitti and two; stationary concentric pipe sections mounted therein; n; spaced relation the y p n ra-nce of e' sa d partshaving aisliding oint there- 7 r between, and means providing a seal for said down movements of the bowl, and means for I raising and lowering the burner bowl with reference to said 011 level comprising a part rigid with the bowl, a stationary support,

an upright member on said support and a rotary member operatively engaging sald upright member and said part whereby 1n the rotation of said rotary memberthe burner bowl is caused to move up or down and means for holding the bowl against rotating.

37. In an oil stove, the combination of a burner bowl, means including an extensible pipe connection for maintaining a constant oil level, and means for raising and lowering the burner bowl with reference to said oil level comprising a part depending from the.

bowl, an upright stationary part with which the first part is operatively associated, means operatively connecting said parts including a member mounted coaxially of the second part and adapted when rotated to cause the burner bowl to move up and down, and means for preventing relative rotation between the parts of the pipe connection.

38. The combination of an oil burner, means for maintaining a constant oil level including a stationary feed pipe, an extensible pipe connection between the burner bowl and said feed pipe comprising a pair of telescoping pipe sections, and means operatively associated with said pipe sect-ions including a member mounted on an upright axis and adapted when rotated to impart a raising or lowering movement to the burner bowl.

39. The combination of an oil burner having-a burner bowl, means for maintaining a constant oil level including a pair of telescoping pipe sections, and means for raising and lowering the burner bowl with reference to said oil level comprising a part rigid with the burner bowl, a stationary upright member and a rotary member operatively connecting said part and said upright member in coaxial relationship and adapted when rotated to impart an up and down movement to theburner bowl. i

40. The combination of a burner bowl, means for maintaining aconstant oil level including a pair of telescoping pipe sections freely slidable with respect to each other,

and means for sealingv the sliding joint be tweensaid sections including a chamber having therein a quantity of mercury 1n which one end of one of said pipe sections is immersed.

ll. The combinationof an oil burner hav- I 1 ing an annular trough, means for'maintaininga constant oil level, and means for raising and lowerig said trough with reference to said oil level, the first mentioned means comprising an extensible oil conductor having two relatively slidable pipe sections, and means for supporting a quantity of mercury or the like in Which the free end of the. outer pipe section is immersedwhereby to provide a seal against the leakage 01 oil from the conducton 42. In an oil stove, a conductor for oil comprising two relatively slidable telescoping pipe sections, and means providinga seal to prevent the leakage of oil by capillary attraction from the conductor by way of the sliding joint between said pipe sec:

tions, said means including a chamber for supporting a quantity of mercury or the like in which the free end of the outer telescoping pipe section is immersed.

43. An oil stove having, in combination, a vertical tubular member, .a hand wheel having a screw thread connection with said 

